Problems about the introduction of Request and Response in the use of slim

when using php"s lightweight slim framework, I found two introduction of Request and Response:
1. Slim\ Http\ Request;
2. \ Psr\ Http\ Message\ ServerRequestInterface
I wonder if there is a difference between the two?
if mixed, will it cause an error?

Slim php

Jul.06,2021

using 1
2 is interface Ah

ServerRequestInterface is a Request interface based on PSR-7 specification

Request is an implementation of ServerRequestInterface

ServerRequestInterface should be injected when using dependency injection
only Request can be used in practical use

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