[ST34-001] - Charlotte Katakuri (Starter Deck 34: PURPLE Charlotte Katakuri)

Imagine that I have two "ST34-001 Charlotte Katakuri" and 10 DON!! cards on my field during my turn. I return 1 DON!! card to my DON!! deck, and activate the effect of one of my "ST34-001 Charlotte Katakuri" to add 1 DON!! card from my DON!! deck and rest it. Can I then use another card's effect to return 1 of the DON!! cards on my field to my DON!! deck, activate the effect of the other "ST34-001 Charlotte Katakuri", and add 1 more DON!! card from my DON!! deck and rest it?

No, you cannot.