The two sides recently met just before Christmas in a well-contested affair at the Meadowbank Sports Arena in Magherafelt.
Cormac Izuchukwu and James McCormick scored tries which were converted by James Humphreys, before Ben Gibson touched down in the corner to secure a 19-15 win.
This encounter will see changes made right throughout the matchday squad, which will be captained by Harry Sheridan.
Callum Reid, Declan Moore, and Scott Wilson form a powerful front row, with Cormac Izuchukwu and Frank Bradshaw-Ryan providing an imposing combination in the second row.
Harry Sheridan moves to blindside after starting the previous game at lock, with Matty Rea on the openside, and David McCann at number 8.
There's an entirely new halfback pairing as Rhys O'Donnell links up with James Humphreys, as Jake Flannery moves across to start at inside centre, with Ben Moxham starting alongside him in midfield.
Wingers Ethan Graham and Rob Lyttle join fullback Shea O'Brien to form a dynamic back 3 combination for Ulster.
James McCormick, George Saunderson, and Gareth Milasinovich provide front-row cover from the bench, joined by fellow forwards Conor Neary, Adam Montgomery and Zac Solomon.
James Girvan, Ben Gibson - who scored the decisive winning try in the reverse fixture - and Henry Boyle will cover the backline.
Ulster A v Ealing Trailfinders A, Fri 6 Jan, 2.30, Trailfinders Sports Club
15-9: Shea O'Brien; Rob Lyttle; Ben Moxham; Jake Flannery; Ethan Graham; James Humphreys; Rhys O'Donnell
1-8: Callum Reid; Declan Moore; Scott Wilson; Cormac Izuchukwu; Frank Bradshaw-Ryan; Harry Sheridan (c); Matty Rea; David McCann
Replacements: James McCormick; George Saunderson; Gareth Milasinovich; Conor Neary; Adam Montgomery; Zac Solomon; Ben Gibson; James Girvan; Henry Boyle
