I don't know based on the rulebook. The provided context (see page 22) explains how a player may rob another if they share a space and meet the requirements, but it does not specify how to resolve situations where multiple players wish to rob each other simultaneously or in the same round. The rulebook does not address the order of resolving such actions or whether both robberies can occur.

To answer this, the rulebook would need to clarify:

• The order in which players declare and resolve actions when on the same space.
• Whether multiple robberies can occur between the same players in a single round.

Source: page 22.

Source: Core Rulebook (pp. 13, 14, 21, 22, 26)