Thanks for the extra information but I'm still left confused.
If a care worker accepts money from a client (where that money is freely given) they will almost certainly be in breach of their contract with their employer (especially if they try to hide the payment) but they WON'T be committing any criminal offence. It only becomes 'fraud by abuse of position' where 'dishonesty' is involved:
https://www.legislation.gov.uk/ukpga/2006/35/section/4
So the Crown Prosecution Service clearly takes the view that the care workers were 'dishonest' in some way. There's nothing in the information that you've provided to indicate why they should be taking that view, so we're still left largely in the dark as to the case against them.
Based upon the EXTREMELY limited information we've been given (but taking into account the sums involved), my best guess would be that (if convicted) the offenders would be given custodial sentences but that those sentences would probably be suspended.