Strict answer: No.

In Jain Dharma, attachment (rāga) is broader than just possessiveness or clinging.

• Possessiveness (mamatva) is a form of attachment.
• Clinging is also a form of attachment.
• But even if possessiveness is not felt, attachment can still exist in subtle form.

So:

• No possessiveness ≠ no attachment
• No clinging ≠ complete detachment

Only when there is no rāga, no mamatva, and no inner dependence, then it is true detachment.

In short: possessive and clinging both are attachment, but attachment can exist even without obvious possessiveness.