Are these "more valuable" since they are marketed by Colt
They were not 'marketed by Colt'. Colt had nothing to do with them, in fact, they sued ASM to stop production.
ASM produced several such guns while attempting to negotiate a license agreement with Colt's Manufacturing Co., essentially trying to get in on the 2nd and 3rd Generation Colt business. Colt turned them down, but ASM had already built and shipped several guns to retailers.
They're ASM, pure and simple. And way overpriced at that.