It would work. It's just that the 2X18 secondaries are at a sweet spot for a lot of the projects around here, with regards to bias current / device dissipation and how the OS is setup. I tend to use the same power supply for many different projects. My own monoblocks have the 4220's (w/ active rectification) and sometimes I run into situations where the slightly "too high" rail voltage prevents me from cranking the bias current where I really want to run it. We dare not push a single device (TO-247) above 50W of dissipation if we're wise. Even then, you better have an ample HS / mounting solution, and know what you're doing with that game (maybe someday I will.. 
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Is the store going to get "pocket fisherman"? Or at least include the "worlds smallest juicer"? I missed out on original offer back then!
I did another search of this forum on the sourcing question, and someone pointed out that Siliconix might have second sourced the part (way back when) which may have been closer to the IR parts than the Harris version. But it's still unclear to me whether Vishay is using the Siliconix or Harris process, both companies having been absorbed there. "Siliconix" appears on the Vishay DS, but ¯\(ツ)/¯.
I agree that any distinction is not worth stressing out over. It's just another detail hobbyists (or greedyboyz) like to obsess about.
