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Irv, they are listed with identical specifications (Buds pictures show rear sight difference but, lists Fully Adjustable Bomar Rear Sights for both). Colt Customer Service should be able to state the exact difference at Tel: 800-962-COLT (2658) *Mon-Fri 9am to 5pm EST

Irv - The Gold Cup Lite ( O5070GCL) does not have the checkering/lines on the front and back grip strap. The 05070xe does have (25 lpi) checkering/lines on the front and back grip strap. That is the only difference I am aware of between the two.