[Tex/LaTex] Beamer subfigure numbering

Question

Is it possible to continue the sub-figure numbering across two frames in beamer?

I have four figures which are placed using subfigure, and need to place two on one frame and two on another. The ones on the first should be numbered (a) and (b), and the ones on the second should be (c) and (d).

Basic code

\begin{frame}
\begin{figure}
\centering
\begin{subfigure}[b]{0.45\textwidth}
 \includegraphics[width=\textwidth]{1.png}
 \caption{Fig1}
 \label{fig:1}
 \end{subfigure}
\begin{subfigure}[b]{0.45\textwidth}
 \includegraphics[width=\textwidth]{2.png}
 \caption{Fig2}
 \label{fig:2}
 \end{subfigure}
\caption{Caption.}
\label{fig:caption}
\end{figure}
\end{frame}

\begin{frame}
\begin{figure}
\centering
\begin{subfigure}[b]{0.45\textwidth}
 \includegraphics[width=\textwidth]{3.png}
 \caption{Fig3}
 \label{fig:3}
 \end{subfigure}
\begin{subfigure}[b]{0.45\textwidth}
 \includegraphics[width=\textwidth]{4.png}
 \caption{Fig4}
 \label{fig:4}
 \end{subfigure}
\caption{Caption.}
\label{fig:caption}
\end{figure}

\end{frame}

Answer 1

\documentclass{beamer}
    \usepackage{graphicx}
    \usepackage{subfig}

    \begin{document}
\begin{frame}
    \begin{figure}
    \centering
\subfloat[Fig1 \label{fig:1}]{
    \includegraphics[width=0.45\textwidth]{example-image-a}}
\subfloat[Fig2 \label{fig:2}]{
    \includegraphics[width=0.45\textwidth]{example-image-b}}
\caption{Caption.}
\label{fig:caption}
    \end{figure}
\end{frame}

\begin{frame}
    \begin{figure}
    \addtocounter{subfigure}{2}
\centering
    \centering
\subfloat[Fig3 \label{fig:3}]{
    \includegraphics[width=0.45\textwidth]{example-image-a}}
\subfloat[Fig4 \label{fig:4}]{
    \includegraphics[width=0.45\textwidth]{example-image-b}}
\caption{Caption.}
\label{fig:caption}
    \end{figure}
\end{frame}
    \end{document}

I consider that subfigure is obsolete and it is replace width subfig or subcaption. In my MWE I select subfig.