They aren't the same thing but do function similarly. With a Roth TSP, you can contribute far more than a Roth IRA. For 2018, you can contribute $18,500 in the Roth TSP, vs $5,500 ($6,500 if over 50) for the Roth IRA.
https://themilitarywallet.com/thrift-savings-plan-contribution-limits/
https://www.tsp.gov/PlanParticipation/EligibilityAndContributions/TaxTreatment/index.html
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