Hi sunclock, and firstly , a warm welcome to this here forum,
you can name the suggested manufacturer/trade name on here! ( unless of course it is deemed offensive!!

)
how ever , as with any type of skirting, from Cumbria to Kent, unless the supplying timber yard always goes back to the same individual ORIGINAL manufacturer it can and usually is different,
i have in the past had the problem caused by my tooling supplier, i used the same codes for the new replacement blades, only to find they had been altered by 2mm by the tooling manufacturer!! (was not a happy bunny!!)
it may be a case of finding the nearest one to the profile you need, and "blending" it into the existing, or even the age old trick (lot more work i know) , but taking the required bit from somewhere that is the same but does not notice if a replacement "similar" section is used to replace it!
regards Wolf!