From the centre line of the WC pan 15" or 380mm to any abutment is comfortable. But sometimes circumstances shrink the distance.
Dry fit by placing the pan in the desired position and sitting on it - will it fly?
Yes, grey and black 110mm will make a compatible fit. However, for the sake of a few quid its best to keep to the same traditional soil pipe color - black.
And never re-use push fit soil pipe fittings unless you've changed the rubber seals.
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