Not exactly. Champion was Tange's family name for their seamless CrMo tubesets, of which their were six different grades (thickness and butting combinations). Tange (Champion) #1 was the 2nd highest of the six Champion tubesets. Prestige was a heat treated version of the top Champion tubeset. Infinity also used the same alloy but was seamed to make production more economical.

To put things into a Reynolds perspective for the OP, Prestige is roughly equivalent to Reynolds 753.

Why would somebody put an Infinity fork on a Prestige frame? Putting a relatively heavy, seamed fork on a very light frame is strange, to say the least.