question on Stock heads and stainless steel valves

[RFbuilt]

was wondering.. on factory stock cylinder heads (bare , with guides and seats) 

are the aftermarket stainless steel valves, interchangeable ? (intake stem thickness and exhaust stem thickness)

asking because in my "how to rebuild" book..

it states for 61-74 heads stem diameter are as follows :

intake - 0.3126" to 0.3130"
exh    - 0.3114" to 0.3118"

not sure if the diff of  7.94-95mm  intakes
and                         7.91-92mm exhaust 
stem dia.  would be big enough? to not be able to interchange exhaust stainless valves into intake  or vice versa..

thank you guys