Technically Dick, no. It would be a bit like tying a Peter Ross with Mallard rather than Teal. Nowt to stop you tying the dabbler with whatever you want though... it would be tied 'dabbler style'

and I'm sure it would be a very nice fly too.
Be aware though that Mandarin (too limp for a bona-fide dabbler) and many other duck feathers just don't 'behave' like Mallard... another reason why it won't strictly speaking be a dabbler.
I did something 'dabbler style'

with some Mandarin last winter... I'll dig it out in a mo...
There ye go Dick...