I am tripping over random spare victor 884’s from I think two years ago, maybe last year. I honestly have no idea where they came from. Our team needs a few more for this year, so instead of paying for em, can I just use the spares I have.
YES , I DID a search on, VICTOR, 884, controllers, PWM, and found zilch. 
Yes, according to this answer from the Q&A system:
ID: 1295 Section: 5.3.4.2 Status: Answered Date Answered: 1/25/2005
Q: In previous years you could only use victors of red or blue labels. Can we use both this year as long as the victor still falls under the other rules for additional parts.
A: See R22. You may use any 884 series.
Same thing for old (blue) spikes.