What is a 1041/1041sr form?

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U.S. Income Tax Return for Estates and Trusts 

The fiduciary of a domestic decedent's estate, trust, or bankruptcy estate files Form 1041 to report: The income, deductions, gains, losses, etc. of the estate or trust. The income that is either accumulated or held for future distribution or distributed currently to the beneficiaries.

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There is no such form as a "1041sr". There is, however, a 1040-SR.

Form 1040-SR is available as an optional alternative to using Form 1040 for taxpayers who are age 65 or older. Form 1040-SR uses the same schedules and instructions as Form 1040 does.

See https://www.irs.gov/forms-pubs/about-form-1040-sr