How do i convert four separate images to a searchable pdf? OCR?

You can select multiple images in the Finder and if Preview is your default app to open them just press command+down arrow. Then command+p to print and save them as a PDF.

Make sure Preview preferences are set to "Open group of files in the same window"

Preview Preference

The following apps have various levels of accuracy.

PDF Converter with OCR.app

OCRWizard.app

I use this macro frequently if it is of any use.

Super Fast Screen Capture and Rename - (5) OCR the Selection.kmmacros (25 KB)

Macro screenshot

Keyboard Maestro 11.0.4
• Support Apple Text Recognition in OCR Condition. (Unexpected inconsistency in OCR)