The Steady Catalyst and The Momentum Builder
These are general tendencies, not rules or predictions. People are more than their structure.
How they meet
Both of you want things to move. The Steady Catalyst improves one thing calmly until it is done. The Momentum Builder sees an opening in every change and wants to use it.
What tends to work
You rarely have to convince each other that progress matters. The Momentum Builder finds the new route when a door closes. The Steady Catalyst makes sure the route actually gets walked to the end.
Where it strains
The Momentum Builder gets restless when things stay the same, and The Steady Catalyst would rather finish than switch. One of you may feel held back, and the other may feel that nothing is ever allowed to settle.
What helps
Decide together what gets finished before anything new begins, and keep that list short. The Momentum Builder can bring new ideas as proposals, not as changes of plan. The Steady Catalyst can say yes to one of them on purpose.