Is our back boiler compatible with any type of gas fire?

We have been living in our house for 6 months now and would like to change the gas fire. We currently have a Baxi fire front (similar to the GF3 Super) which stands proud of the chimney breast. I would like to install a flush fitting fire which recesses into the chimney breast without affecting the back boiler. Is this possible straight away? Would the back boiler need moving and if so how simple is this for a CORGI registered fitter? Is any gas fire compatible with a back boiler even if I did not go for one that recesses into the chimney brest? I would appreciate any help on this or if anyone thinks they can help but need more info let me know!