With a hate if things flexible , if possible would come up out if the existing soil socket with a 90° then another 90° running parallel with the wall , socket facing the pan outlet and straight connector between the two. Apologies if already suggested.
Yes, both have a socket that is larger than the 110mm pipe so it all depends on how tight the fins fit within the socket. If it's a nice snug fit then all should be fine if it's loose then a piece of pipe would be advised.
It's tricky to do, but you could remove the stub of pipe from inside the socket in the floor... A lot depends on how well it was glued in, but there are methods.
Probably not a DIY job though as if I mess the current fitting up I'd have to bust out the ceiling below to make it good again... the toilet faces the outside wall, where the stack is and to get to the toilet the waste runs across the bathroom in the joist bay.
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