It might depend on where you got them. This is what I found on the Murray McMurray (hatchery) website when I clicked on their "Rhode Island Red" description:
"No other heavy breed lays more or better eggs than the Rhode Island Reds. Our "production" strain is keeping up the fine reputation of this old favorite."
I'm thinking that hatchery RIR's are most likely production reds, while true RIR's have to be purchased from a breeder. Kind of like the americauana / easter egger deal -- easter eggers from a hatchery and americaunas from breeders.
Our broody hatched some RIR eggs last spring. There is nothing in this world like the color of a breeder quailty RIR and a hatchery RIR. My RIR rooster was so deep in color that in the shadow of the roost he looked nearly black.
the differences ive been able to tell is production red chicks are yellow where as rir are a dark red. by the time they are grown the rir are deep mahogany colored and huge and productions are just red and smaller.
Feathersite has production reds pictured on their RIR page and does not have a separate page for the PRs. According to feathersite, PRs are actually just hatchery RIRs (not a mix) - bred for production instead of color, etc.