Mauser 71, Mauser 71/84 interchangeability

I found a Mauser 71/84 that is a real beater. Bore looks great, exterior not so much. It's missing parts and I need to decide pretty quickly if it would be worth trying to get. I've located "most" of the parts and they seem reasonable. This is what it is missing:

The rear bolt components including the firing pin, firing pin spring, cocking piece, firing pin nut, safety catch, safety catch spring, magazine spring, magazine follower, magazine cap and stacking rod.

I've found from Numrich or other sites all but the firing pin, firing pin spring and the magazine cap and stacking rod.

I have located a bolt for a Mauser 71 which is complete. Will the firing pin and rear parts interchange with the 71/84 bolt? I know there are some differences, ejector being one and the top screw assembly. Price is prohibitive on buying both the complete bolt and the bolt parts.

Or I could just take my time and find parts through other sources. Don't have the rifle yet, may not get it, it's an auction gun.

All for naught I believe. I just looked up the second rifle they paired this with. When they consider rifles to be "junk" they sell them in pairs. The second rifle is a Winchester boys rifle that gunbroker listings put between $700-$1200. No idea why they would do this. They didn't even put photos on their website for these two. I must be missing something. But then again, it is the auction from hell.

2nd highest bidder but I was good and stopped when things got out of line.