The difference between a historical sound change and a speech stream sound change is a difference in definition.
Stream of speech sound change is a ****emporal, temporary change. Streaming sound change is found everywhere in speech communication. The same structural unit of speech will change differently due to the different speech environments in which it is located; even if it is located in the same speech environment, it will be pronounced differently by different people, and the same person will pronounce it differently at different times. Therefore, we can only generalize the general and universal phenomenon of speech sound change.
Historical phonological change refers to the change in the speech of a specific language from one era to another. It is fixed and ephemeral. For example, the Chinese language from ancient to modern phonological system changes.
Other changes
Assimilation: two different phonemes, one of which is influenced by the other and becomes the same or similar to it. For example, in English, the plural s is pronounced as a clear s after a clear consonant, as in books, and as a z after a turbulent consonant, as in dogs.
Dissimilation: two identical or similar phonemes, one of which becomes different from it for some reason. Alteration in Mandarin is a typical phenomenon of alienation. For example, when two upper consonants are connected, the first one becomes yangping, such as "tiger, exhibition".
Weakening: In the flow of speech, the pronunciation of some phonemes becomes weaker and less clear, this phenomenon is weakening. The soft sound in Mandarin is a typical example of weakening.
Shedding: Weakening is further strengthened by the loss of certain phonemes, or the omission of certain because in the process of rapid pronunciation, which forms shedding. In English, "I am" is said as "I'm".