The Nissan Path

I've been searching around on this forum for a while and have seen mention of the Bilstein HD's 4600 series
Is part number 24-197427 and 24-197434 HD's?
or are they the regular ones? 4600 series
If so what's the difference between them and what is the part number for the regular Bilsteins? 4600's

Front struts are P/N: 24-197427
Rear shocks are P/N: 24-197434

Both are Bilstein 4600 series, or "HD's"...they are the same. The 4600 series is designed for stock ride height trucks and SUV's. The 5100 series is for lifted trucks or SUV's.