No. Credits cannot be 'swapped'. Quick service is quick service, and table service is table service, and never the 'twain shall meet.
You can never ever ever ever ever use any number of CS entitlements for a TS meal; and, with certain rare 'magical' exceptions, TS entitlements have historically only been allowed to be used to 'purchase' CS meals during the mid-August to early-October Free Dining promo - and even that won't be known for sure this year until, well, mid-August.