\documentclass{article}
\usepackage{guitarchordschemes}
\thispagestyle{empty}

\begin{document}

% general parameters
\setchordscheme{
  rotate=-90,
  x-unit=2.5mm,                % chord size, x
  y-unit=3mm,                  % chord size, y
  name-format=\bfseries,       % chord name font
  finger-format=\bfseries%
    \footnotesize              % fingering font
}

\newsavebox{\Gstd}
\savebox{\Gstd}{
\chordscheme[        % define the chord
  name = G (Sol),    % chord name
  position = 1,      % first fret position
  finger = {2/5:2} , % fret, string, finger
  finger = {3/6:3} , % fret, string, finger
  finger = {3/1:4} , % fret, string, finger
  ring = {2,3,4}     % open strings
]}

\newsavebox{\Gbarre}
\savebox{\Gbarre}{
\chordscheme[
  name = G (Sol) barre,
  position = 3,
  barre = 1/1-6,     % fret, string range
  finger = {2/3:2},
  finger = {3/5:3},
  finger = {3/4:4}
]}

\usebox{\Gstd}\usebox{\Gbarre}

\end{document}