Regear of diff's. Issue with number of splines on rear

[xychix]

Mate of mine is looking to regear his 2GD revo.

https://www.4x4works.co.uk/product/revo ... of-ratios/
The kit comes with a pigion that ends in a 34 teeth spline while the part he has to bind that spline to the driveshaft seems to accept 29 splines.

41204-0K110, seems to be the expected item connecting the pignion to the driveshaft

By looking on VIN I've figured out that his car has: 41204-0K130


Does anyone know the difference between these two?
Can anyone confirm the amount of splines on item 41204-0K110?
Would this be a bolt in replacement of would other diameters / distance of studs etc be a dealbreaker?