[netbook] HP Stream 11 Pro G3 - two chargers which do I use ?

[ReBoot]

School has bought a bunch of these. They are supplied with 2 physically different chargers. Both are rated at 45W and both reference the same HP replacement part 741727-001

 

Individual part #s are:

854054-001

854054-004

 

Looks like different revisions of the same part - nice to have two but a bit confused over why. Anyone seen anything similar when buying HP ?

 

Cheers