Both players were dismissed in the final seconds of the Reds' dramatic 38-34 Super League home victory over the Robins at the Salford City Stadium on Sunday.
The pair were charged with grade B punching offences by the Rugby Football League and the governing body has now confirmed Walker has submitted an early guilty plea.
That means he will not face a disciplinary hearing and will miss next Sunday's home clash with Warrington.
There has been no such confirmation for Jewitt and he could face a one or two-match suspension if found guilty at a disciplinary hearing.
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- Rugby Football League