750-4. what spark plugs w green Dyna coils?

I think it should be fine.... as long as there is no obvious difference in length etc.

I compared the datasheets for these two spark plugs, and my understanding it that everything is identical, accept for the gap
LR14C 1485 has 0,7mm gap and BR8ES has 0,8. So the gap is smaller on the one I`m using now, and that is more safer also?
If you have more gap then specification you running on a higher risk when its come to temperature?

Please see attached compare table I made.

www.brisk.biz/catalogues/spark-plugs/auto/super

www.ngk.com/product.aspx?zpid=9559

That small difference in gap probably wont make any noticeable difference.