Id put money on POTF ones being all black and Trilogo ones being very dark blue.
Because a lot of the early identifiers for accessory accuracy came from the US, where the POTF figure was prevalent this became the de facto weapon of choice.
Trilogos weren't given any credibility until more recent years, so stands to reason that they weren't considered when it came to determining correct accessories. Im 100% confident that as a UK collector, the Luke Stormie I bought back in the day would have had a dark blue blaster.