How can I tell if these worms are Eisnenia fetida (red wiggler)?

Question

I dug up some worms from some horse manure. Some of them are greyish and some of them are pink red. They don't seem to have those conspicuous stripes that everyone talks about (at least not upon first looking).

However they all have yellow tips on their tails

Answer 1

"The worm predominantly sold for composting is the red wiggler or red

tiger worm, Eisenia fetida. It has a rusty brown color with alternating

yellow and maroon bands down the length of its body; a pigmentless

membrane separates each segment. It grows up to three inches long and is

highly prolific. Though the worm has established itself in the wild here,

so far it has not been identified as a problem species.

"Another popular compost species, the red worm, Lumbricus rubellus, is

causing trouble, however, and should be avoided. It also grows up to three

inches long and has a history of being confused with E. fetida. This worm

is dark red to maroon, has a light yellow underside, and lacks striping

between segments.