CBI 204.211 discusses pay scales. Sub-paras 4 and 10 apply in your case:
(4) (Rate of pay - University Training Plan (Non-commissioned Members) and Special Commissioning Plan) A lieutenant or second lieutenant to whom the University Training Plan (Non-Commissioned Members) or Special Commissioning Plan applies shall be paid, for each month after the month and year specified in the table, at the rate of pay for the officer's rank and and pay increment as follows
if appointed to the rank of officer cadet directly from the rank of private, in pay level A of Table "B" or "C" to this instruction;
if appointed to the rank of officer cadet directly from the rank of corporal or above, in pay level D of Table "B" or "C" to this instruction.
if commissioned directly to the rank of lieutenant or second lieutenant from a non-commissioned member rank, in pay level D of Table "B" or "C" to this instruction
(10) (Officer Cadet - former non-commissioned member) An officer cadet to whom an officer entry plan at paragraghs (4), (6), (7) or (8) applies, who is appointed directly to that rank from a non-commissioned rank shall be paid.
if the member was a non-commissioned member of the Regular Force, at the rate of pay which, including any upward adjustments to the rates of pay determined under subparagraphs (i) and (ii) that may be established from time to time, and any upward adjustments resulting from the reallocation of the last military occupation in which the member served as a non-commissioned member to a higher trade group, is the greater of the rate of pay established for
the rank, pay increment, pay level and trade group held on the day immediately prior to the date of appointment to the rank of officer cadet, or
any higher pay increment to which the member would have become entitled had the member remained in the former rank, pay level and trade group as a non-commissioned member; and
if the member was a former Regular Force member who re-enrols or a member who transfers from the Reserve Force to the Regular Force, at the rate of pay in pay level "D" in Table "A" and pay increment as determined in orders or instructions issued by the Chief of the Defence Staff.
And then see sub-para 11 as well, which states:
(11) (Limitations on pay increments) Subject to CBI 204.015 (Incentive Pay), the number of pay increment increases may not exceed the maximum number of pay increments for the applicable pay level and table to this instruction, and is further limited as follows:
b. in the case of an officer cadet who is paid under pay level D in Table "A", to no pay increment increase regardless of time served in that rank;
All this to say: You keep your pay and any future IPC increases; if you were put on pay table D you'd get no increases until comissioning. Sounds like you've got the better deal.