There are a few that may use their own die or have slightly different head sizes such as Jsb/air arms/FX and one of the gun makers brands.
H&N hft and weihrauch ft are another.
crosman magnum/ Webley accupells/silco and another makers branded pellet are the same too.
can't remember the makers branded ones but I think the daystate sovereign pellets are one of them.
Perhaps someone will know which ones and post it here.
A guy at air arms told me about their pellets, I've compared h&n to the Weihrauch and the accupells all come in the same tins.