I think the Merlin has less tyre clearance – my G2P fits max 40mm+45/50mm guards.
My G2P also has infuriatingly bad design of mounting bolts for racks that foul the through axle lever, plus bottle cages that aren’t positioned as low as possible, reducing frame bag space.
And don’t get me started on the mis-made forks that miss out key mounts.
Not sure if there are revised versions of the G2P frame – mine has rear mudguard mounts which are very close to the rear through axle (but don’t foul, just!), and pannier mounts further up. It also came with different forks to the earlier ones (matt black carbon) which have mudguard mounts on the inners of the legs, and a front threaded mount on the crown (although just front, not all the way through).
I would agree on tyre clearance though – you are never going to get fat tyres in there, although I reckon you could squeeze 45mm in there at a push.
It’s more of a ‘racing bike made burlier’ than an out and out gravel/tourer – but that matched with what I wanted pretty much.