RDP limits vs RKD limits

Hello
We are using RKD (Refinitiv Knowledge Direct) API for Filings Search. It has a limit of 2 requests / second.
Also we investigated that RDP API has Filings Search as well.
So I have next questions:
1. What is the main difference between RDP and RKD? Could you explain why you have 2 similar platforms?
2. What is the limit for Filings Search from RDP? Is it different from RKD limits? Are these limits connected?
3. Can we reuse RKD API credentials for RDP API or it's totally different platforms with it's own credentials?

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