You've left far too much information out to be able to definitively answer your question, such as governing code, job specs, drawing requirement, etc., etc.
However, in a general sense - The WPS is a set of instructions on how to produce a weld joint in an approved manner. The work done in accordance with an approved WPS may not be changed or modified beyond proscribed limits. Doing so creates a rejectable condition. If changes are required, the WPS must be revised in a manner that is in compliance with the governing code/specs.
Tim