Answer: identicaltwins

AnswerCrossword Clue
IDENTICALTWINS

They come from a single ovum

IDENTICALTWINS

Matched pair

IDENTICALTWINS

Metropolitan Stadium siblings?

IDENTICALTWINS
Tweedledum and Tweedledee
IDENTICALTWINS
Family pair who are hard to tell apart
IDENTICALTWINSRingers
IDENTICALTWINSHumphrey Metrodome clones
IDENTICALTWINSTiki and Ronde Barber, e.g.