For an individual central bank, the differences can be striking. Figure 13 for Sweden’s Riksbank is based on Iancu et al. (2020) data, Figure 14 is based on Ito and McCauley (2021) data.
In the aggregate, there are differences between the relevant data sets. The first figure is for USD shares, the second is for EUR shares.
Figure 1: USD shares of international reserves from IMF COFER (green), Iancu et al. (red), and Ito and McCauley (blue).
Figure 2: EUR shares of international reserves from IMF COFER (green), Iancu et al. (red), and Ito and McCauley (blue).
The differences are attributable to coverage (COFER covers in principle all reporting IMF members, while Iancu et al. and Ito-McCauley cover different sets of countries), and treatment of reserves.
Ito’s presentation of the data at the NBER data workshop is here. Previous Econbrowser posts on central bank rebalancing and holding composition. The data set website is here (available in either Excel or Stata formats). Unfortunately, the coverage in this publicly available data set is smaller (63 countries) than that used in Chinn-Ito-McCauley (73 countries), due to confidentiality restrictions imposed by several Latin American central banks.