DRIVERS SEAT BECAME QUITE FLAT, FOAM CUSHION?

hi I need some help please

I used to have Scout 2008 then got an opportunity to get Octavia 1.4 TSi 2010 in really great shape so swapped the front seats as the Scout had electric 1 with memory and all.

It used ot be lovely and not it is not anymore so I figured out I need new foam seat cushion.

are they the same? I don't have the old VIN so cant check compatibility before buying.

plus have anyone replaced it on their own? a bloke I called up quoted £250 plus VAT, seems steep when  the car itself was 2.4K

would be grateful for any advise;

Are the seats same across the range in terms of shape and size? feels they are as the base fitted and it looks kind of the same.

can the foam seat cushion be bought on the cheap or its got to be original?

is is difficult to renew yourself or got to pay to have it done?

cash it tight in the pandemic...

thanks in advance