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Ok coming from a DJing background there's a few things to consider here.
0. Track choice. This is the pinnacle where you get this wrong the mix may fail from the off. Treat mixing records like a universal jigsaw, every now and again you'll get a corner piece with limited exits.
1. Timing is key. First of all the bpms don't match so you'll need to speed up one and/or slow down the other so they do beat sync. What's known as 'trainwreck' to 'potsnpans', or 'clanger' when the mix fits then instadrifts if you don't keep beats in sync throughout. Definitely a major part of the puzzle, and no one wants a clanger (crowd wince isn't a good look...)
2. Placement. What we mean by this is WHEN to mix the tracks. Usually tracks like these have intro, main drop (where the energy hits the crowd), breakdown mid section (could be a beatless part of a stripped back section, or what would be a drum or break solo) into 2nd drop to outro. Now depending on what's in each section for each track, you can mix the two by 'sneaking' in the 2nd track to enhance the 1st (if there's beats without melody they can be cool to mix on top). Watch how hip hip djs mix the section, spinback the record and mix it again, like cut n paste. They don't mix and let it run (unless you wanted to LTJ Bukem mix for 8mins solid which he does with ease), they replay the section (like retriggering a sample or Rex player, or copy-paste audio clip). While the 1st track plays and now hits it breakdown, youve got more mixing options; do you chopmix (slicing each track so you mix by "swapping" tracks stylistically to create another beat pattern. Or full bar mixing...) Choices
3, Style. Do you transition (which means step 2 above applies because you need to start track 2 at the right point so you fade mix) or are you going DJ Yoda route....or Grandmaster flash....or do you Jive Bunny Mixmaster it by solely doing it all edited seamlessly. The DJ route can be more natural but could be open to being too loose if you miss your timing (#2 above).
4. Tools. Depending on how you want to work your style relies on the tools of the trade. If you're a carpenter and you need to make banister spindles get a lathe, else doing by hand is way more work and end result doesn't meet expectation. Same for any trade or profession. Same applies for music writing. Before crossfaders were a thing djs used volume faders (same idea yet 2 level controls to cross mix). Think about how the equipment was in the era these were made, two turntables and a mixer, EQ or kill filter switches and pretty much it. So keep it simple, or.... If you want today's tech thees sooooo many cool tools that would have blown yesteryear's djs away "kids now got it good" and looking around today, they're not wrong.
5. Tuning. Yes if you tried these two together as they are the keys maybe out, but listen back to rave tapes back then. How many tunes WERE in key when mixing. People back then didn't care too much about key until people heard 'power mixes' which were in key which changed everything. And key editing returns back to tools needed.
These aren't rules, merely suggestions to what would be needed to help. You just need to take this recipe (not as gospel) to make your own mix your way. Hope this helps
With those 2 tracks, Area 51 track has 6mins to utilise with Sweet Sensation 'chops', and around 1min28 there's a quality beat loop we would use to 'tease' in the track and have some fun with that. There's a drop section in Area 51 around the middle, which is likely the best place to transition (use lpf tweaks to mask the highs) the intro to Sweet Sensation, there's not much time before Sweet Sensation beat kicks in so you'll need to be quick with it and then mix out Area 51 just before Sweets drop hits . You want that beat to have real impact so if you've got at least quarter to half bar before that's a smooth maybe less obvious transition (the filtering of Area 51 earlier gives more room sort of like how the track was intended to sound)