Something to consider... For a short period of time here, you can still purchase AK74 kits. Do the build or hire it done. The extra parts you currently have will help pay for the receiver and build. You end up with an AK74 and a SAR2. Two guns that will use the same ammo and mags. Two guns will always be 'better' than one.
In the future, if money grows tight or you just tire of them, you can sell one or both. As a buyer of a used firearm, I like to keep things simple. Example: I approach you at a gunshow and ask if your AK is for sale. I look at it and see that the recever says that it is a SAR2. But it's not. You explain that it started as a SAR2 and you added this piece and somebody else added that piece. My interest level is going down with the length of the tale. I now have to factor in the typical SAR concerns (canted sights and gas block), used gun concerns (condition and how much use/abuse) and whether the modifications were done right. I offer a fair price for a used SAR2. You get offended because you've put all this extra work and money into your rifle. No deal.
Alternative scenario: I ask if one or both of the AK's you're carrying is for sale. One is a nice kit build AK74 with compliance parts. Looks good, and is just what I want. Deal. Or, I don't have quite enough cash but I can afford the stock SAR2. Deal. I'm happy. You're happy because you only needed to sell one rifle to pay for your unexpected car repairs and you still have a rifle to shoot.
Hope you are happy with whatever you decide.