@dibl - it's a bit more complicated - but similar:
* the MBR points to a place where a bootloader can be found (one can more than one MBRs - one per disk.
* A UEFI entry point to a bootloader - you can have only one UEFI, but more than one bootloaders.
This look like:
% efibootmgr -v
BootCurrent: 000A
Timeout: 0 seconds
BootOrder: 000A,000B,0000,0008,0009,0005,0006
Boot0000* Windows Boot Manager HD(2,GPT,2c6e03bb-05f6-426a-ba22-60faccf3bffd,0xe1800,0x32000)/File(\EFI\Microsoft\Boot\bootmgfw.efi)WINDOWS.........x...B.C.D.O.B.J.E.C.T.=.{.9.d.e.a.8.6.2.c.-.5.c.d.d.-.4.e.7.0.-.a.c.c.1.-.f.3.2.b.3.4.4.d.4.7.9.5.}...a................
Boot0005* UEFI OS HD(1,GPT,82ea967a-af96-4482-b2c9-f41ede5b35a5,0x800,0x200000)/File(\EFI\BOOT\BOOTX64.EFI)
Boot0006* Hard Drive BBS(HD,,0x0)AMGOAMNO........o.C.r.u.c.i.a.l._.C.T.5.2.5.M.X.3.0.0.S.S.D.1....................A...........................>..Gd-.;.A..MQ..L. . . . . . . . .6.1.4.4.4.1.2.8.D.5.9.9......AMBOAMNO........o.C.r.u.c.i.a.l._.C.T.5.2.5.M.X.3.0.0.S.S.D.1....................A...........................>..Gd-.;.A..MQ..L. . . . . . . . .6.1.6.4.4.1.F.A.3.7.5.E......AMBOAMNO........o.S.a.m.s.u.n.g. .S.S.D. .8.5.0. .E.V.O. .2.5.0.G.B....................A...........................>..Gd-.;.A..MQ..L.2.S.P.1.X.N.G.A.3.8.2.8.5.7. .X. . . . ......AMBOAMNO........o.S.a.m.s.u.n.g. .S.S.D. .8.4.0. .P.R.O. .S.e.r.i.e.s....................A...........................>..Gd-.;.A..MQ..L.1.S.R.2.E.N.D.A.2.1.8.8.7.3. .N. . . . ......AMBOAMNO........o.S.T.3.0.0.0.V.N.0.0.0.-.1.H.J.1.6.6....................A...........................>..Gd-.;.A..MQ..L. . . . . . . . . . . . .6.W.2.A.Q.4.Y.Y......AMBOAMNO........o.S.T.3.0.0.0.V.N.0.0.0.-.1.H.J.1.6.6....................A...........................>..Gd-.;.A..MQ..L. . . . . . . . . . . . .6.W.1.A.Z.P.P.D......AMBO
Boot0008* UEFI: IP6 Realtek PCIe GBE Family Controller PciRoot(0x0)/Pci(0x15,0x1)/Pci(0x0,0x0)/MAC(60a44c62abd1,0)/IPv6([::]:<->[::]:,0,0)AMBO
Boot0009* UEFI: IP4 Realtek PCIe GBE Family Controller PciRoot(0x0)/Pci(0x15,0x1)/Pci(0x0,0x0)/MAC(60a44c62abd1,0)/IPv4(0.0.0.00.0.0.0,0,0)AMBO
Boot000A* siduction HD(1,GPT,82ea967a-af96-4482-b2c9-f41ede5b35a5,0x800,0x200000)/File(\EFI\siduction\grubx64.efi)
Boot000B* debian HD(1,GPT,82ea967a-af96-4482-b2c9-f41ede5b35a5,0x800,0x200000)/File(\EFI\debian\grubx64.efi)