I would be surprised if the Hull Trains and TPE sets are much different internally to those already in service with GWR bar the colours of seating material - the First Group-specified 802s for GWR are going to be the same as the DfT-specified 800s.
And which company holds the TPE franchise and majority stake in Hull Trains? First Group.
The TPE 802s are going to fit in 16 more passengers (342 seats) than the GWR five-cars (326), while the Hull Trains sets are apparently going to seat 327.
The key difference that First Group was interested in with the 802s, and has got, is full-on engine power all the time and acceleration settings to its preferences, rather than those the DFT wants on the 800s.
And perhaps any further specific discussion of the seats could be conducted in the dedicated thread linked to below, so that attempts to discuss other aspects of the trains are not swamped by repetitive posts about why certain people like certain seats and other people like other sorts of seats...
https://www.railforums.co.uk/thread...n-the-ieps-vs-hsts.160789/page-2#post-3339429