I ordered two red ones with PCC 6378481 and I can't see any difference compared
to two other yellow parts in my inventory that were added almost a year ago (I
don't remember their origin).
The cylinders have the same part no. (4255), I see no difference in the pump
and spring, and the part pushes back approx. the same according to my weight.
/Jan
P.S. The new part no. was previously mentioned here: