Where is the align tool for objects in premiere pro 2025?

On the Premiere Pro side, you'll have to eyeball the size of the objects or size them to the same size outside of Premiere Pro.  To set the size outside of Premiere Pro, select the object source and choose Edit > Original, resize the artwork to match (Photoshop or Illustrator are good likely applications to use for this), and save.  Since Edit > Original was used, the changes should show right away in the Premiere Pro project.  If not, select the source in the Project panel or Bin panel, right-click, choose Replace footage, and then replace the source with itself.

If you're in After Effects, select an object and choose Layer > Transform > Scale to open the Scale dialog box for the object.  In the Scale dialog box, change the Units pop-up menu from "% of Source" to "Pixels" and then enter the size in pixels for the object.  Repeat until the same size has been set for each object.

If each object is its own graphics file format (like PNG) placed in Video Tracks of the Timeline, select them in the Timeline and then right-click and choose Replace with After Effects Composition.

If each object is it's own graphics file format (like PNG) in a Graphic, then import them into the Project, add them to the Timeline and then replace them with an After Effects Composition.

The Align panel in After Effects can align to the Composition as well as distribute selected Layers.  Any edits made to the graphics in After Effects will carry forward to the Composition in the Premiere Pro Timeline when the corresponding After Effects project file is saved.