They are both interim protection, but they serve different kinds of claim. A preliminary attachment secures the collection of a monetary claim — or a claim for security — by seizing the debtor’s assets, and it can be obtained before an action or enforcement proceedings have even been started. It sits in the Enforcement and Bankruptcy Law (İİK, No. 2004).
A preliminary injunction applies to everything that is not a money claim: prohibiting the transfer of an asset, suspending its use, preventing a right from being exercised, or simply preserving the existing state of affairs. It sits in the Code of Civil Procedure (HMK, No. 6100). The short rule is this — if what you want is a sum of money collected, it is a preliminary attachment; if what you want is something done, not done, or held as it is, it is a preliminary injunction. Which route applies follows from the nature of the claim, not from preference.
Shall we apply this matter to your situation?
Tell us your specific situation in a few sentences; we'll assess it with the right team.