As long as the spur to your hob is rated for sufficient current for whatever induction hob you may buy in the future and the oven, the two hobs are interchangable without any rewiring.
The only caveat is that if your ceramic hob is single-phase, you must get an induction hob that supports single phase. Most UK marketed ones will.
The more powerful induction hobs require >30A nominal so a standard 32A rated spur may be insufficient for the hob alone, let alone an induction hob and and oven.
As such it would make sense to install a seperate spur for the hob when you change over to induction at a later date. I would go for cabling and switches designed for a 40A or 50A spur.