Yes, but the ECM of the 95 would have to be reflashed to remove the interface with the (electronically controlled) automatic transmission.
The 2006 GMC Sierra-2500HD has a 5-speed manual.
The 2001 GMC Sierra-2500HD has a 5-speed manual.
The 2002 GMC Sierra-2500HD has a 5-speed manual.
The 2003 GMC Sierra-1500 has a 5-speed manual.
The 2005 GMC Sierra-2500HD has a 5-speed manual.
The 2006 GMC Sierra-1500 has a 5-speed manual.
The 2004 GMC Sierra-1500 has a 5-speed manual.
The 2001 GMC Sierra-1500 has a 5-speed manual.
The 2005 GMC Sierra-1500 has a 5-speed manual.
The 2003 GMC Sierra-2500HD has a 5-speed manual.
The 2004 GMC Sierra-2500HD has a 5-speed manual.
NO, not even close. Chevy redesigned the engines and transmissions in late 1999.