Tianjin dialect is generally categorized as a separate subsection of Jilu official dialect, so it's not categorized in the same system as Cebuano. However, most people believe that Tianjin belongs to the Dialect Island, while others believe that Tianjin should belong to the Central Plains Official Dialect, and I'm not particularly sure how it should be categorized. The first tone (yinping) in Tianjin is pronounced as a low-flat tone, a distinctive feature originating from the vicinity of Suzhou. However, several other tones are more influenced by nearby regions, and the differences with Mandarin are limited. Vocabulary, too, has both Anhui and Hebei influences.
To really compare the degree of similarity between the two dialects, you need a professional, mainly looking at the pronunciation of single words, tonal patterns, tone types, and in the case of Northern dialects, comparing the pronunciation of flat, warbling and incoming sounds, etc., and then comparing vocabulary and grammar. Just listening to everyday conversations is not enough. In fact, it is often the case that two neighboring counties joke about each other's "lack of standard", but linguistically they are very close dialects.
About Tianjin dialect, I don't have enough information, so I don't have a very authoritative explanation, but it can be regarded as a kind of Jilu official dialect, which is greatly influenced by Suzhou dialect.