Need driver side driveshaft for my ford focus estate 1l, 2013, can't see the part number on it, my passenger side driveshaft got this number BV61-3B437-TA, so i expect driver side should be BV61-3B436-TA but when searching on ebay most of them shows as 6 speed, but my is 5 speed. Or is there no difference?

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Part numbers aren't always sequential in that way.

5 speed & 6 speed gearboxes do use different driveshafts.  As do different sized wheels.  In fact, there are 8 different options just for the RH shaft between 2012-2015!

The parts catalogues only give us a Finis number though, so we can't confirm the manufacturing numbers in your post.

Europe, Focus CB8 2011-2015, 2 Chassis, 20504 Chassis.Driveshaft - Front Axle, 2050410J Drive Shaft - Front Axle Drive - Catcar.info

3B436 does look correct for RH driveshaft but could be different letter at start of suffix that matches your car.

Try some searching for other parts instead of TA, i.e SA, RA etc

Having parts going up to T and maybe beyond suggests there’s a lot of different variants as mentioned above.