Advice on balancing Indian-Urdu and Pakistani-Urdu vocabulary for a first trip

I'm heading to Lahore next month and I’ve been using resources that seem to lean heavily toward the Hindi-Urdu hybrid style common in North India. I’m worried about using words that might sound 'off' or confusing in a Pakistani context. As a busy professional with only 20 minutes a day, should I prioritize learning specific regional vocabulary, or will I be understood as long as my grammar is solid?