A 1993 RG470 would have an Edge trem, not a TRS. The difference between it and an RG5xx that year was that the 470 didn't have the slanted heel(this is old heel here) and the plate mounted jack. A 1993 RG570 would have a LoPro Edge and a Barrel(flush with rear plate) jack.
I would guess the 'cost cutting' would be the Edge instead of LoPro, less routing on the body, and the cheaper jack?
Also keep in mind that you can't put a modern(after 1994) AANJ neck onto an old heel(pre-1994) body.