And not really no. Personal unions were dying out in the 17th century, and were few and far between by the 18th. I can think of only two in that century (Britain and Hanover, Saxony and Poland, and briefly Sweden and Hesse-Kassel).
Britain and Ireland, technically, even though Britain was clearly the dominant partner... in fact, Britain and Ireland and Corsica [!], for a few years in the 1790s.
Austria (effectively united, although theoretically still four separate duchies [Austria proper, Carinthia, Carniola, & Styria], at least one Imperial County [Tyrol], plus whatever the various bits of either 'Further Austria' [in Swabia, some extending into lands that now are Swiss] or the Hapsburgs' lands at the head of the Adriatic counted as...) with the 'Lands of the Crown of St Wenceslaus' (Bohemia &, Moravia, and whatever bits of Silesia -- and even, early on, Lusatia -- were still linked to those; not for two brief interludes), the 'Lands of the Crown of St Stephen' (Hungary, Transylvania, Croatia), and the Duchy of Milan (later the 'Duchies of Milan and Mantua'), until just
after the end of the 18th century when the 'Austrian Empire' was proclaimed uniting them.
Bavaria with the 'Lands of the Crown of St Wenceslaus', instead, 1742-1745.
Brandenburg-Prussia (effectively run as a unified state, I think, even though Brandenburg was inside the HRE whereas Prussia itself wasn't, but theoretically -- as in, the ruler got a separate vote in the Imperial Diet for each of them
except Prussia -- three Duchies [Prussia, Further Pomerania, Magdeburg], one Margraviate [Brandenburg, to which the Electoral role and various conquered territories were attached], and three Principalities [Halberstadt, Kammin, Minden]) with not only various statelets in Westphalia [possibly also under a unified administration with Brandenburg?] but also with both the Principality of East Friesland (from late in the 18th century; self-governing under its own old laws) and the Principality of Neuchatel (from 1707 ; also self-governing, and actually an ally of the Swiss Confederation).
Denmark with Schleswig & [varying amounts of ] Holstein, and for a while with Oldenburg, and for a while with the [unified, but still worth 2 votes rather than just 1 in the Diet'] 'Duchy of Bremen & Principality of Verden'.
"Hanover" with both the 'Duchy of Bremen & Principality of Verden' (having acquired this from Denmark) and -- from later in the 18th century -- the Duchy of Saxe-Lauenburg.
The Duchy of Modena with, from fairly late in the 18th century, the smaller North Italian state of 'Massa and Cararra'.
Savoy (including its various acquisitions in Piedmont) with the County of Nice (from Medieval times), and with firstly the Kingdom of Sicily (the island realm; 1713-1720 only) and then the Kingdom of Sardinia (1720+).
Sicily [the kingdom containing the eponymous island) with 'Sicily' (the kingdom in mainland Italy whose capital was Naples) for most of this period .
Tuscany with the 'Lands of the Crown of St Wenceslaus' (under Francis of Lorraine, Holy Roman Emperor, husband of Maria Theresa).
and various other combinations of smallish statelets in [by modern definitions] Germany or Italy.