Ok, now I have a bit of time Kenny, I checked a paper owners manual for the V40. It actually states bpr5es. Hercules I am not sure, but they are an identical motor - if you look up the hercules motor the v40 photos actually come up as well.
I have a 6es in my v40 and haven't observed any problems
Part of the problem arises when many of these manufacturers use torch spark plugs - whose heat range never perfectly lines up.
Sanli 118cc version of this motor comes with a FR6TC
If you look up FR6TC, it will say it interchanges with bosch WR7DC, which is a bpr6es (common for many cars as well - Camira use 6es and pretty sure valiant among others did as well). But then they also say BPR5ES
Honda had the courtesy of using the same plug in many things BPR6ES was in the old civics, and quite possibly some of their motor bikes.
Provided they have the protruded tip plug (P in NGK), I wouldn't worry about 1 heat range.
What I would be worry about is making sure the rpm isn't above 3100 - they like throwing rods
