Robin,
Even allowing fore the vagraries of display colour reproduction, the dark green sample paint you show touching up the edge of your cover is nothing like Reseda Green – the background colour does appear to be RAL6011.
Over more years than I care to recall, I have witnessed acres of Reseda Green on a great many machines – it was the default colour that my previous employer used on CNC machine tool rebuilds if the customer didn't have a specific requirement. Your Warco cover looks very like Reseda Green to me, as does the paint in the tin I linked to though, as with all paint, there will be variations between manufacturers & even between different batches from the same manufacturer. It isn't unusal to mix the contents of multiple new tins of paint before use on large jobs that require more than one tin to ensure that the colour is constant across the job.
Nigel B.