I'm going to install an upgrade trigger on my M&P 15-22, but I need to know some further information regarding the pins

Are the Colt 901 hammer and trigger pins interchangeable? In other words are the 2 pins needed identical?

Brownells sells them one (1) at a time at a cost of $5.99 each.

The description on their website refers to them as 901 HAMMER & TRIGGER PIN Colt.

If in fact they're interchangeable, this is the best price I've seen for these pins X 2 is only a total of $11.98.

But, I'm not absolutely certain if the pins are interchangeable, anyone know?

Thanks!