In a game littered with missed chances from both sides, United led on the half hour mark through Will Pettitt but eventually found themselves 2-1 down after the break.
Dexter Tomlinson, captain for the day, advanced from centre-half to score United's equaliser with 13 minutes to play.
Boston: Austin Barker, Finley Hipkin, Oliver Houlston, Sean Bray-Smith (Denis Matei 70), Dexter Tomlinson, Jake Thompson (Charlie Brooks 60), Rueben Fogg, Toby Cotton, Will Pettitt, Zac Hardy, Lake Taylor-Peak (Lewis Greenfield 46). Subs (not used): Finley Ging, Zach Marsh (gk).
Referee: Istvan Mod.