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Get the installation instructions for both. Compare the wiring diagrams. It is unlikely that the more modern one requires more input / output or a different power supply. If it does, then yes you need someone to help you. If it does not, it's a diy job with all the usual precautions when working around electric stuff.
Howard
fredtc
I have a drayton SM2 that controls when our hot water and heating comes on
and I'd like to swap it for a https://www.toolstation.com/drayton-lp111-timeswitch/p98366
Is this a simple job, or do I need to get in a plumber/electrician?