Just a week after his first F1 victory at the 190th attempt, Perez will start at the back-of-the-grid for the season-ending Abu Dhabi Grand Prix along with Magnussen.
Perez's Racing Point requires a new internal combustion engine, traction control and MGU-H, all the fourth of the season when only three are allowed.
Magnussen's Haas, meanwhile, is in need of a new control electronics and energy store, both the third of the season when the regulations permit the use of just two during a campaign.
Perez departs Racing Point after Sunday's event as the team have recruited four-time champion Sebastian Vettel to help usher in its rebranding as Aston Martin from next year.
The 30-year-old Mexican is still anxiously waiting to see if Red Bull will sign him as team-mate to Max Verstappen for 2021 over current driver Alex Albon.
Magnussen, meanwhile, is poised for a new career in sportscars, with the Dane set to enter the 24 Hours of Daytona at the end of next month.