% dimens are taken from the final tables (TEXpage)
\newdimen\tableAwidth
\newdimen\tableAheight
\tableAwidth= 1655.39105bp
\tableAheight= 969.22291bp
\definepapersize[tableA][width=\tableAwidth, height=\tableAheight]

\newdimen\tableBwidth
\newdimen\tableBheight
\tableBwidth= 698.65893bp
\tableBheight= 489.67048bp
\definepapersize[tableB][width=\tableBwidth, height=\tableBheight]
 

\definelayout[tableA]
  [location=middle,
   width=middle,
   height=middle,
   paper=tableA,
%   clipoffset=0mm,
%   horoffset=0mm,
%   veroffset=0mm,
   cropoffset=auto,
   trimoffset=2bp,
   bleedoffset=3mm,
   marking=on,
   backspace=0mm,
%   bottom=0mm,
%   bottomdistance=0mm,
   bottomspace=0mm,
   cutspace=0mm,
   footer=0mm,
   footerdistance=0mm,
   header=0mm,
   headerdistance=0mm,
   leftedge=0mm,
   leftedgedistance=0mm,
   leftmargin=0mm,
   leftmargindistance=0mm,
   margin=0mm,
   rightedge=0mm,
   rightedgedistance=0mm,
   rightmargin=0mm,
   rightmargindistance=0mm,
   textdistance=0mm,
   textmargin=0mm,
%   top=0mm,
%   topdistance=0mm,
   topspace=0mm,
  ]

\definelayout[tableB]
  [location=middle,
   width=middle,
   height=middle,
   paper=tableB,
   clipoffset=0bp,
   cropoffset=auto,
   trimoffset=2bp,
   bleedoffset=3mm,
   marking=on,
   backspace=0mm,
%   bottom=0mm,
%   bottomdistance=0mm,
   bottomspace=0mm,
   cutspace=0mm,
   footer=0mm,
   footerdistance=0mm,
   header=0mm,
   headerdistance=0mm,
   leftedge=0mm,
   leftedgedistance=0mm,
   leftmargin=0mm,
   leftmargindistance=0mm,
   margin=0mm,
   rightedge=0mm,
   rightedgedistance=0mm,
   rightmargin=0mm,
   rightmargindistance=0mm,
   textdistance=0mm,
   textmargin=0mm,
%   top=0mm,
%   topdistance=0mm,
   topspace=0mm,
  ]


\setupbackend % check the pdfbox sizes with scite
   [level=0]


% trigger for pdfboxes (disable to see printpaper)
\setupinteractionscreen[width=max,height=max]

\setuppapersize[tableA][A1,landscape]%
   
\starttext
\showframe 
\setuplayout[tableA]%
%
\framed[width=\tableAwidth,height=\tableAheight,offset=overlay,rulethickness=10pt]{\bfc tableA}
%
\page[yes]% needed
\adaptpapersize[tableB][A3,landscape]%
\setuplayout[tableB]%
%
\framed[width=\tableBwidth,height=\tableBheight,offset=overlay,rulethickness=10pt]{\bfc tableB}
\stoptext