Different groupId (and version) for a same Maven project

I have a project in which a Maven project is deployed in two different ways using two groupIds and different versions. For example:

a) Depends on a branch (using jitpack):

    <dependency>
        <groupId>com.github.user</groupId>
        <artifactId>myProj</artifactId>
        <version>aaaaaa-SNAPSHOT</version>
    </dependency>

b) Depends on a ... version (other source):

    <dependency>
        <groupId>org.user</groupId>
        <artifactId>myProj</artifactId>
        <version>1.0.0-SNAPSHOT</version>
    </dependency>

I am using method a). My project also depends on some other project which deploys method b). I don't know, how can I override the b) or how can I tell Maven that these are same project and ask them to use a).

This provides a way to use same project with different artefact names using classifier. I also looked on Dependency Management but could not really understand. I am not an expert in this field.