¿Por qué la lista de propiedades generada por mktextfm es diferente de la predeterminada en TeXLive?

¿Por qué la lista de propiedades generada por mktextfm es diferente de la predeterminada en TeXLive?

Mi configuración: TeX Live, versión 2014.20141024-2 (empaquetado con Debian 8 Jessie)

Guardar PL predeterminado:

$ tftopl cmr10 > cmr10.pl.old

Generar nuevo TFM:

$ mktextfm cmr10
mktextfm: Running mf-nowin -progname=mf \mode:=ljfour; mag:=1; nonstopmode; input cmr10
This is METAFONT, Version 2.7182818 (TeX Live 2015/dev/Debian) (preloaded base=mf)

(/usr/share/texlive/texmf-dist/fonts/source/public/cm/cmr10.mf
(/usr/share/texlive/texmf-dist/fonts/source/public/cm/cmbase.mf)
(/usr/share/texlive/texmf-dist/fonts/source/public/cm/roman.mf
(/usr/share/texlive/texmf-dist/fonts/source/public/cm/romanu.mf [65] [66]
[67] [68] [69] [70] [71] [72] [73] [74] [75] [76] [77] [78] [79] [80] [81]
[82] [83] [84] [85] [86] [87] [88] [89] [90])
(/usr/share/texlive/texmf-dist/fonts/source/public/cm/romanl.mf [97] [98]
[99] [100] [101] [102] [103] [104] [105] [106] [107] [108] [109] [110] [111]
[112] [113] [114] [115] [116] [117] [118] [119] [120] [121] [122])
(/usr/share/texlive/texmf-dist/fonts/source/public/cm/greeku.mf [0] [1]
[2] [3] [4] [5] [6] [7] [8] [9] [10])
(/usr/share/texlive/texmf-dist/fonts/source/public/cm/romand.mf [48] [49]
[50] [51] [52] [53] [54] [55] [56] [57])
(/usr/share/texlive/texmf-dist/fonts/source/public/cm/romanp.mf [36] [38]
[63] [62]) (/usr/share/texlive/texmf-dist/fonts/source/public/cm/romspl.mf
[16] [17] [25] [26] [27] [28])
(/usr/share/texlive/texmf-dist/fonts/source/public/cm/romspu.mf [29] [30]
[31]) (/usr/share/texlive/texmf-dist/fonts/source/public/cm/punct.mf [33]
[60] [35] [37] [39] [40] [41] [42] [43] [44] [46] [47] [58] [59] [61] [64]
[91] [93] [96]) (/usr/share/texlive/texmf-dist/fonts/source/public/cm/accent.mf
[18] [19] [20] [21] [22] [23] [24] [32] [94] [95] [125] [126] [127])
(/usr/share/texlive/texmf-dist/fonts/source/public/cm/romlig.mf [11] [12]
[13] [14] [15]) (/usr/share/texlive/texmf-dist/fonts/source/public/cm/comlig.mf
[34] [45] [92] [123] [124]) ) )
Font metrics written on cmr10.tfm.
Output written on cmr10.600gf (128 characters, 24096 bytes).
Transcript written on cmr10.log.
mktextfm: /usr/local/share/texmf/fonts/tfm/public/cm/cmr10.tfm: successfully generated.
/usr/local/share/texmf/fonts/tfm/public/cm/cmr10.tfm

Primero: mktextfm no debería generar un nuevo TFM si ya existe uno. Segundo: compare el PL antiguo y el nuevo. Se supone que son iguales, pero no lo son. ¿Por qué?

$ tftopl cmr10 | diff -u cmr10.pl.old -
--- cmr10.pl.old
+++ -
@@ -1,6 +1,3 @@
-(FAMILY CMR)
-(FACE O 352)
-(CODINGSCHEME TEX TEXT)
 (DESIGNSIZE R 10.0)
 (COMMENT DESIGNSIZE IS IN POINTS)
 (COMMENT OTHER SIZES ARE MULTIPLES OF DESIGNSIZE)

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