B7HS-10 Vs BR7HS-10

[Fishery Pokery]

Hi,

I have two engines, an 1984 15D Yamaha and a 1984(ish) 8hp Mariner.

The Mariner uses B7HS-10 and the Yam recommends BR7HS-10 spark plugs.

I have read the R stands for resistor and is supposed to reduce radio interference.

I want to stock up on spares but was wondering if one can be used in place of the other so I don’t have to carry a number of spares for each engine?

I did read one type protects cdi engines (?).

Thanks in advance for any help.

[Fishery Pokery]

I guess this is a tricky question.

I have bought spares of both now so not to worry.