Physios get better and more detailed teaching in Pharmacology than Nurses???? I don't think so.
Physios gain more knowledge during their training than Nurses??? That is plain down ridiculous.
Everyone gets taught what they need to know and in as much detail as is required. Nurses might not need the depth of teaching in Physiology that Physios require (although that is not completely correct either), but on the other side, Physios do not get taught about wound care management e.g..
Physios and Nurses will therefore cover very different areas in their curriculum. As for OTs and SLTs.
The pay relates to requirements that need to be fulfilled according to the applicable standard, e.g. "Band 5". The standards only relate to your own profession and the level of skill required for a Physio to work in a Band 5 Physio position is equal to level of skill required for a Nurse wanting to work in a Band 5 Nursing position.
I am surprised that your friend knows so much about the contents of each curriculum, when she hasn't even studied yet. But, as her statements are wrong, I presume, it was all guess work. And she obviously undervalues Nursing.
Stay strong.
Cheers!