Is there a way to adapt the Apple Pencil model A1603 to my iPad Pro 4th Generation?

No.

Both Pencils pair and charge differently.

Sorry.

You NEED to purchase qnd use the newer 2nd gen Pencil.

No. It requires a Lightning connector.

(210575)

Apple Pencil (2nd generation)

You can use Apple Pencil (2nd generation) with these iPad models: 

• iPad mini (6th generation)
• iPad Air (4th generation)
• iPad Pro 12.9-inch (3rd generation) and later
• iPad Pro 11-inch (1st generation) and later

Apple Pencil (1st generation)

You can use Apple Pencil (1st generation) with these iPad models:

• iPad (9th generation)
• iPad (8th generation)
• iPad mini (5th generation)
• iPad (7th generation)
• iPad (6th generation)
• iPad Air (3rd generation)
• iPad Pro 12.9-inch (1st or 2nd generation)
• iPad Pro 10.5-inch
• iPad Pro 9.7-inch

Not sure which iPad you have?

Identify your iPad model. 