Short answer: Yes, Jain devotees can keep their Jain donations separate in a shared space, and it is usually advisable to do so to maintain clarity and respect for both traditions.

Key points:

• Dana (donation) in Jainism is a virtuous practice, often directed to Jain trusts, temples, or charitable causes aligned with Jain ethics (ahimsa, seva, and samparka with learning and service).
• In a shared setup with Hindu deities or temples, there is no Jain prohibition on participating in the space, but keeping Jain donations in a clearly labeled, separate box or envelope helps avoid confusion and shows respect for both communities’ practices.
• Practical tips: use distinct containers or envelopes for Jain donations; label them clearly (e.g., “Jain Dana for [cause/temple trust]”). If possible, designate a specific time or place for Jain contributions to be collected.
• Attitude: approach the space with reverence for the beliefs of others, avoid disputing or pressuring others about your practices, and focus on the Jain aim of ahiṃsā, truth, and charitable service.
• There can be regional or community differences (even among Digambar and Śvetāmbara households) in how shared spaces are managed; if you are part of a specific community, consult your local seniors or a trusted Jain teacher for context-specific guidance.

If you’d like, tell me the exact situation (temple layout, whether the space is primarily Jain, or a multi-faith hall, and who manages the donations). I can tailor the guidance to your circumstances.