A quick Googling reveals that the first one is for the 4 pot cars while the second is for the 6 pot ones. Nothing to do with ride height, likely just valved differently, which makes sense since shocks/struts don't determine ride height, only springs do.

I'd get the first ones as the others would likely make your car ride harshly. Also, 50 quid cheaper.

 

Ohh if it doesn’t effect ride height fuck it I’ll go with the standard ones thx for the advice😏

 

When I tried Billy B4s, I remember reading from trusted sources the difference was to account for the different ride heights of stock suspension and M-Sport suspension. As Vick says, the spring determines the ride height, but they offer different dampers to better match those different ride heights. At least that's my recollection.

My advice on buying aftermarket parts is not to completely trust compatibility claims on seller's websites but to go to the manufacturers' websites and look up the correct part numbers for your application yourself.

Click the Browse Catalogue button here:
BILSTEIN B4 - BILSTEIN Workshop
And you can enter your car's details to find matching products. You can also lookup the BMW part number on bmwfans.info or realoem for your VIN and put those part numbers into the web catalogue, to see what Bilstein part numbers they correspond to.

However, my experience is the B4 rides a little firmer than (new) BMW dampers. If you want to restore the BMW ride, I'd fit Sachs/Boge, the original supplier to BMW. You can browse their catalogue here
Find the Right Spare Part Quickly With the ZF Aftermarket Catalog

 

Thanks for the tip I’ll take a look at the original website from the brands. And I will think about the Sachs👍 I appreciate it guys thanks for all!