both plugs are resistor type thats the 'R' and the same heat range the 'EYA' is an antifouling electrode and if you have ever fouled the 'ES'the 'EYA' useually solves that trail side plug change. I have used both and it is harder to foul an EYA ,you have to really try them in your sled to see,also make sure to use solid terminal type.
Br9eya vs br9es
What is the difference between these two plugs besides the groove in the electrode? The 9 tells me that the heat range is the same...why do I need to spend extra to replace the 'S' with a 'YA'??
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