Archispirostreptus gigas, different forms?

[AlanMM]

This week i recieved an order of millipedes labeled Aphistogoniulus sp. madagascar. This should be a fire millipede.
It was very clear these were mislabeled and they look very similar to the Archispirostreptus gigas wich i also have, although i do see some difference in coloration of the legs.
All these millipedes are around 26cm and have the same body color as Archispirostreptus gigas.
Are there other species of millipedes that reaches lengths up to 28cm?
Or could this be a different color form of Archispirostreptus gigas (because the color of the legs are different) ?
I don't care about the mislabeling stuff, i just wonder what species this could be...

Here are some pictures:

Archispirostreptus gigas:

Unkown species:

 

[Travis K]

If you take color out of this question all together then you have what looks like, IMO, two separate species.

 

[Fyreflye]

The legs on the unknown look slightly longer and thicker, but that's my impression from the photo. My AGBs are still babies, so unfortunately i don't have a lot of experience with pedes (yet).