Will summer ed in O-G confuse LiPS instruction?

My son is currently receiving LiPS instruction 5x/week at his school, and it has significantly improved his progress in reading.
We would like to place him in a summer school program given by a school for language-based lds, but they use Orton-Gillingham.

Will it confuse him to receive 6 weeks of instruction of Orton Gillingham during the summer, when he is receiving LiPS instruction at school?

Thanks!