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Take this for example.

Cadia is basically one REALLY big PDF. Really, there's no difference between the IG and the PDF, it all just depends on where they're from, who's training them, and how well connected the planet is to the larger Imperium. Short and sweet.

Cadia also happens to be the trademark IG regiments of Warhammer 40k. Chances are, if you've seen anything with the IG, you've seen a Cadian.

Moreover, in retrospect to my last comment, I've also thought of another example of a notable PDF that's practically the same force as the IG:

The Armageddon Steel Legion is constantly fighting Orks on its home world, and though it may be some time between wars, they are about as common as the Dark Crusades Cadia faces.

Apart from that, I agree completely with Lynata, especially with the variation of both vehicles, and unique weapons planetary lords might be able to buy from Rogue Traders that other IG may not have access to.

That's what I was getting at btw. The first line of defense is the PDF of the planet the IG regiments are raised on. All IG forces are commanded by the Administratum, including the PDF through planetary governors. All I'm saying is that the line between IG regiments and PDF's from the same homeworld are blurred.