In principal, Pakistani passport can't apply for Macau visa on arrival, they have to obtain a Macau visa from China embassy/consulate in overseas before arriving in Macau, however, it seems troublesome for you to return to Pakistan to apply for Macau visa, therefore, you can go to Macau first, then try to apply for visa on arrival by using your passport and valid China work visa on your passport. If your application is denied, you have to return to Mainland China.