Pilosocereus pachycladus?

[PixMe]

Hello,

I'm new, so please excuse that I ask for an ID of one of the top ten.

I have two specimen I think might be pilosocereus pachycladus, but I am unsure. Could you help me, please?

Here is the data:

1st one:
Height: 8 cm
Diameter: 3 cm
Ribs: 6
Areoles: ocher, about 1 cm evenly apart
Spikes: gold, about 0.5 to 1.5 cm
Branches: 7

2nd one:
Height: 42 cm
Diameter: 2-5 cm
Ribs: 8
Areoles: ocher, 0.6 cm evenly apart
Spikes: gold, about 0.5 to 1.5 cm
Branches: 1

I think the two might be the same species, but I am confused by the differences concerning the ribs which are thinner for the 1st one.
I don't know if this is important, but I know that the 2nd one survived at least 4 years without any watering on a window pointing to the north.

Thanks in advance

[Kamos]

#1 P. chrysacanthus ?

[coltonschultz]

Very confusing... It seems that younger examples of this species tend to have longer spines and less wool, but as they age they turn blue.

[PixMe]

Thank you for your replies.
Maybe it helps, that both cactie don't have any wool?