Contact system and series fit
The 10977806 is a Milli-Grid header from Molex, listed under series * and shipped in Box packaging.
Peer contrast — 878325922
The 878325922 is a 20-position, 2.00 mm pitch Milli-Grid header with gold mating contacts and Tape & Reel packaging — the 10977806 shares the series but differs in position count and packaging; the pitch and contact system are common across the series.