as far as I can remember those eproms are all interchangeable. As for rare, I doubt it, they were used alot back in those days and earlyin their life came in different flavors, one with a sealed lid that you erased with xrays and another with a widow that you erased with UV light. All UV chips could also be erased by a strong xray generator. Of course this is if I remember right; it could be the 1601 was Xray and the 1701 UV.
As for being worth anything, the 1701 might be but the 1702's were fairly common.... back in the day. So they would be just valuable for their gold content imo.