P38 steering box input shaft spline

Hi all,
I've hit a bit of a roadblock with a project I'm working on. The end user needs the vehicle to be LHD. I'll spare you the details, but in short, it looks like a RHD P38 power steering box would do the trick in a way that the Discovery box I was using previously wouldn't. Does anybody know whether the input shaft on a P38 box has the same spline as the Discovery / RRC / Defender steering boxes?
Thankyou in advance.

i recently bought a second column for my 99 p38, the lower half of the shaft on mine is triangular, the one I bought had a spline on it? I was able to make it up to fit mine using the newer top joint and my lower triangular shaft. I was able to undo the security bolt with a chisel and refit a 10.9 strength bolt with Loctite. All good. Not to sure if the part I bought was even for the p38. Only the fact the assembly was the same length and fitted my upper column! Whether this is any help??