The Pilgrims trailed 2-0 against league newcomers Guiseley at Nethermoor Park but roared back into contention after the break.
The Guiseley clash was United’s only league fixture before their FA Youth Cup campaign begins on September 19 against Lincoln United.
United fell two goals behind before half-time but halved the deficit when NUTTELL struck on 61 minutes.
Their comeback was completed when SANDERS struck on 74 minutes.
Boston (4-4-2): Sam Vince; Niall Delahoy, Charlie Melville (Jack Hall 50), Josh Spencer, Todd Devlin; Curtis Revell, Jordan Sowerby (Karolis Andriulionis 84), Aaron Eyett, Brad Wilson (Juris Kormis 62); Jordan Nuttell, Charley Sanders.