The main difference between the technical communication and the other different kinds of communication is that as follow:
In technical communication, the data or information must be specific and to the point. On the other hand, in general communication there is no such boundary for the conversation.
The content of the technical conversation should be in proper and systematic format and in general communication there is no such formatting required.
The technical communication always focus on the audience and main purpose of the conversation as compared to general communication.