No. You can apply for a grant of citizenship for your adopted child, if:
at least one parent is a Canadian citizen by birth in Canada or through naturalization at the time of the adoption; and
you submit a citizenship grant application with the right documents and fees.
You do not need to withdraw your existing permanent residence application. However, if you do, you may be eligible for a refund, depending on when you withdraw.
If you withdraw your application before the visa office has assessed the sponsorship portion, you will get a full refund.
If the visa office has assessed the sponsorship portion but hasn’t started processing the permanent residence portion, you will get a partial refund (C$75 for children under 19 and C$475 for adults 19 or older).
Once the visa office has started processing the permanent residence portion, you will not get a refund.